[turbofan] Introduce a dedicated CheckMaps simplified operator.

src/compiler/js-typed-lowering.h

Index: src/compiler/js-typed-lowering.h
diff --git a/src/compiler/js-typed-lowering.h b/src/compiler/js-typed-lowering.h
index cf6a5727edbd4159e75e0f1803356af1ca19c818..8e9ac6cf7d890f906b122ee9f93c5f7002b12f94 100644
--- a/src/compiler/js-typed-lowering.h
+++ b/src/compiler/js-typed-lowering.h
@@ -78,7 +78,9 @@ class JSTypedLowering final : public AdvancedReducer {
   Reduction ReduceJSGeneratorStore(Node* node);
   Reduction ReduceJSGeneratorRestoreContinuation(Node* node);
   Reduction ReduceJSGeneratorRestoreRegister(Node* node);
+  Reduction ReduceCheckMaps(Node* node);
   Reduction ReduceCheckString(Node* node);
+  Reduction ReduceLoadField(Node* node);
   Reduction ReduceNumberRoundop(Node* node);
   Reduction ReduceSelect(Node* node);
   Reduction ReduceJSSubtract(Node* node);